diff --git a/step_4_screenshots/Gemfile.lock b/step_4_screenshots/Gemfile.lock
index 9629b07..c5ad00b 100644
--- a/step_4_screenshots/Gemfile.lock
+++ b/step_4_screenshots/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
       ffi (~> 1.9)
     websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.4)
+    websocket-extensions (0.1.5)
 
 PLATFORMS
   ruby